[ 34.590141][ T72] ==================================================================
[ 34.590444][ T72] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 34.590698][ T72] Read of size 1 at addr ffff8880081316ac by task kworker/u16:1/72
[ 34.590933][ T72]
[ 34.591014][ T72] CPU: 0 UID: 0 PID: 72 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 34.591019][ T72] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 34.591022][ T72] Workqueue: netns cleanup_net
[ 34.591032][ T72] Call Trace:
[ 34.591034][ T72]
[ 34.591036][ T72] dump_stack_lvl+0x82/0xc0
[ 34.591042][ T72] print_address_description.constprop.0+0x2c/0x3a0
[ 34.591051][ T72] ? kobject_put+0xbb/0xd0
[ 34.591055][ T72] print_report+0xb4/0x270
[ 34.591059][ T72] ? kobject_put+0xbb/0xd0
[ 34.591062][ T72] ? kasan_addr_to_slab+0x21/0x70
[ 34.591066][ T72] ? kobject_put+0xbb/0xd0
[ 34.591069][ T72] kasan_report+0xca/0x100
[ 34.591073][ T72] ? kobject_put+0xbb/0xd0
[ 34.591079][ T72] kobject_put+0xbb/0xd0
[ 34.591083][ T72] netdev_run_todo+0x5f0/0xc60
[ 34.591089][ T72] ? dev_ingress_queue_create+0x190/0x190
[ 34.591093][ T72] ? generic_xdp_install+0x410/0x410
[ 34.591100][ T72] ops_undo_list+0x714/0x890
[ 34.591109][ T72] ? netns_get+0x110/0x110
[ 34.591112][ T72] ? cleanup_net+0x2d6/0x830
[ 34.591117][ T72] cleanup_net+0x3b2/0x830
[ 34.591120][ T72] ? net_passive_dec+0x190/0x190
[ 34.591124][ T72] ? rcu_is_watching+0x12/0xb0
[ 34.591132][ T72] process_one_work+0xe35/0x1650
[ 34.591141][ T72] ? pwq_dec_nr_in_flight+0x550/0x550
[ 34.591147][ T72] ? assign_work+0x168/0x240
[ 34.591151][ T72] worker_thread+0x591/0xcf0
[ 34.591156][ T72] ? rescuer_thread+0xd10/0xd10
[ 34.591160][ T72] kthread+0x37b/0x5f0
[ 34.591165][ T72] ? kthread_is_per_cpu+0xc0/0xc0
[ 34.591167][ T72] ? ret_from_fork+0x1b/0x270
[ 34.591172][ T72] ? __lock_release+0x5d/0x170
[ 34.591178][ T72] ? rcu_is_watching+0x12/0xb0
[ 34.591181][ T72] ? kthread_is_per_cpu+0xc0/0xc0
[ 34.591185][ T72] ret_from_fork+0x1db/0x270
[ 34.591188][ T72] ? kthread_is_per_cpu+0xc0/0xc0
[ 34.591191][ T72] ret_from_fork_asm+0x11/0x20
[ 34.591200][ T72]
[ 34.591201][ T72]
[ 34.597473][ T72] Allocated by task 253:
[ 34.597593][ T72] kasan_save_stack+0x24/0x40
[ 34.597756][ T72] kasan_save_track+0x14/0x30
[ 34.597912][ T72] __kasan_kmalloc+0x7b/0x90
[ 34.598076][ T72] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 34.598241][ T72] alloc_netdev_mqs+0x7d/0x1370
[ 34.598401][ T72] sit_init_net+0x169/0x550
[ 34.598571][ T72] ops_init+0x189/0x550
[ 34.598691][ T72] setup_net+0xf1/0x380
[ 34.598810][ T72] copy_net_ns+0x21a/0x380
[ 34.598962][ T72] create_new_namespaces+0x35f/0x900
[ 34.599121][ T72] unshare_nsproxy_namespaces+0x89/0x120
[ 34.599299][ T72] ksys_unshare+0x2a3/0x660
[ 34.599464][ T72] __x64_sys_unshare+0x31/0x40
[ 34.599633][ T72] do_syscall_64+0xc1/0xfd0
[ 34.599793][ T72] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 34.600009][ T72]
[ 34.600092][ T72] Freed by task 72:
[ 34.600208][ T72] kasan_save_stack+0x24/0x40
[ 34.600381][ T72] kasan_save_track+0x14/0x30
[ 34.600561][ T72] __kasan_save_free_info+0x3b/0x60
[ 34.600730][ T72] __kasan_slab_free+0x3f/0x60
[ 34.600887][ T72] kfree+0x21d/0x540
[ 34.601016][ T72] device_release+0x9c/0x210
[ 34.601176][ T72] kobject_cleanup+0xfe/0x360
[ 34.601333][ T72] netdev_run_todo+0x81f/0xc60
[ 34.601492][ T72] ops_undo_list+0x714/0x890
[ 34.601649][ T72] cleanup_net+0x3b2/0x830
[ 34.601826][ T72] process_one_work+0xe35/0x1650
[ 34.601983][ T72] worker_thread+0x591/0xcf0
[ 34.602140][ T72] kthread+0x37b/0x5f0
[ 34.602258][ T72] ret_from_fork+0x1db/0x270
[ 34.602431][ T72] ret_from_fork_asm+0x11/0x20
[ 34.602601][ T72]
[ 34.602685][ T72] The buggy address belongs to the object at ffff888008131000
[ 34.602685][ T72] which belongs to the cache kmalloc-4k of size 4096
[ 34.603087][ T72] The buggy address is located 1708 bytes inside of
[ 34.603087][ T72] freed 4096-byte region [ffff888008131000, ffff888008132000)
[ 34.603489][ T72]
[ 34.603569][ T72] The buggy address belongs to the physical page:
[ 34.603769][ T72] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8130
[ 34.604052][ T72] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 34.604292][ T72] flags: 0x80000000000040(head|node=0|zone=1)
[ 34.604523][ T72] page_type: f5(slab)
[ 34.604651][ T72] raw: 0080000000000040 ffff888001043700 ffffea0000204a10 ffffea0000204610
[ 34.604952][ T72] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 34.605242][ T72] head: 0080000000000040 ffff888001043700 ffffea0000204a10 ffffea0000204610
[ 34.605546][ T72] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 34.605838][ T72] head: 0080000000000003 ffffea0000204c01 00000000ffffffff 00000000ffffffff
[ 34.606144][ T72] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 34.606438][ T72] page dumped because: kasan: bad access detected
[ 34.606631][ T72]
[ 34.606712][ T72] Memory state around the buggy address:
[ 34.606866][ T72] ffff888008131580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 34.607122][ T72] ffff888008131600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 34.607348][ T72] >ffff888008131680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 34.607610][ T72] ^
[ 34.607761][ T72] ffff888008131700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 34.608008][ T72] ffff888008131780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 34.608229][ T72] ==================================================================
[ 34.608700][ T72] Disabling lock debugging due to kernel taint
[ 34.608920][ T72] ------------[ cut here ]------------
[ 34.609067][ T72] refcount_t: underflow; use-after-free.
[ 34.609269][ T72] WARNING: CPU: 0 PID: 72 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 34.609556][ T72] Modules linked in: nft_redir nft_chain_nat nf_nat nf_conntrack_netlink nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables veth
[ 34.610499][ T72] CPU: 0 UID: 0 PID: 72 Comm: kworker/u16:1 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 34.610858][ T72] Tainted: [B]=BAD_PAGE
[ 34.610976][ T72] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 34.611172][ T72] Workqueue: netns cleanup_net
[ 34.611334][ T72] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 34.611547][ T72] Code: 83 90 02 80 fb 01 0f 87 95 6b d6 fe 83 e3 01 0f 85 51 ff ff ff c6 05 b1 83 90 02 01 90 48 c7 c7 a0 de 65 b6 e8 c2 8b 15 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 f0 34 a1 ff e9 ba fe ff ff
[ 34.612123][ T72] RSP: 0018:ffffc900004d7a08 EFLAGS: 00010282
[ 34.612329][ T72] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 34.612573][ T72] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 34.612815][ T72] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff6dfe220
[ 34.613054][ T72] R10: 0000000000000003 R11: ffffc900004d7580 R12: 0000000000000001
[ 34.613287][ T72] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 34.613535][ T72] FS: 0000000000000000(0000) GS:ffff88807ddec000(0000) knlGS:0000000000000000
[ 34.613814][ T72] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 34.614010][ T72] CR2: 00007f3e6a541000 CR3: 000000000cb35005 CR4: 0000000000772ef0
[ 34.614244][ T72] PKRU: 55555554
[ 34.614368][ T72] Call Trace:
[ 34.614497][ T72]
[ 34.614580][ T72] netdev_run_todo+0x5f0/0xc60
[ 34.614756][ T72] ? dev_ingress_queue_create+0x190/0x190
[ 34.614919][ T72] ? generic_xdp_install+0x410/0x410
[ 34.615082][ T72] ops_undo_list+0x714/0x890
[ 34.615237][ T72] ? netns_get+0x110/0x110
[ 34.615400][ T72] ? cleanup_net+0x2d6/0x830
[ 34.615557][ T72] cleanup_net+0x3b2/0x830
[ 34.615714][ T72] ? net_passive_dec+0x190/0x190
[ 34.615876][ T72] ? rcu_is_watching+0x12/0xb0
[ 34.616040][ T72] process_one_work+0xe35/0x1650
[ 34.616199][ T72] ? pwq_dec_nr_in_flight+0x550/0x550
[ 34.616365][ T72] ? assign_work+0x168/0x240
[ 34.616522][ T72] worker_thread+0x591/0xcf0
[ 34.616679][ T72] ? rescuer_thread+0xd10/0xd10
[ 34.616843][ T72] kthread+0x37b/0x5f0
[ 34.616964][ T72] ? kthread_is_per_cpu+0xc0/0xc0
[ 34.617117][ T72] ? ret_from_fork+0x1b/0x270
[ 34.617276][ T72] ? __lock_release+0x5d/0x170
[ 34.617438][ T72] ? rcu_is_watching+0x12/0xb0
[ 34.617591][ T72] ? kthread_is_per_cpu+0xc0/0xc0
[ 34.617755][ T72] ret_from_fork+0x1db/0x270
[ 34.617911][ T72] ? kthread_is_per_cpu+0xc0/0xc0
[ 34.618063][ T72] ret_from_fork_asm+0x11/0x20
[ 34.618245][ T72]
[ 34.618367][ T72] irq event stamp: 5823
[ 34.618487][ T72] hardirqs last enabled at (5823): [] finish_task_switch.isra.0+0x245/0x960
[ 34.618832][ T72] hardirqs last disabled at (5822): [] __schedule+0x94a/0x1b10
[ 34.619127][ T72] softirqs last enabled at (5716): [] handle_softirqs+0x352/0x610
[ 34.619419][ T72] softirqs last disabled at (5709): [] irq_exit_rcu+0xab/0x100
[ 34.619707][ T72] ---[ end trace 0000000000000000 ]---